Not true at all. I've had suggestions from lot's of people including friends. The difficulty is balance and making things work. Laguy442 is right, the mod does have compatibility issues.
I plan to open up a section of the list that deals with game changing mods like Project Zulu, Better Than Wolves etc. Pixelmon seems like a good fit here. I've looked at the mod and the wiki and I am interested so don't worry about it just yet.
This section will not be config supported and will be there for people who want to try different things.
Look for it in the coming weeks. I'm back on morning shift so I'll be awake during the day finally. Things should be getting back to normal. The overnight thing was supposed to just last until Christmas and I basically had to do another month of it... Working overnights is awful. Kills any life you may have. I hope I dont have to do that anymore...
- - - Updated - - -
Also, it looks as though 1.7 will come and go without many mods making the transition. It's somewhat worrying, but I feel like many of the mod authors are in feature development mode right now. Updating to 1.7 doesn't seem like a priority.
The only problem I can see is if it goes to 1.8 the mods will need massive overhaul to make them compatible. 1.7 update is already a huge undertaking, so I worry that 1.8 will compound that. I hope that mod authors have at least begun looking at 1.7 so if 1.8 rolls in then they have a leg up.
- - - Updated - - -
For the list, I'll post where there are mods to post. So far the only mod on the list (besides Forge) that is 1.7 ready is Craftable Horse Armor, which is just a recipe mod. I'm not holding back any 1.7 updates and if mods do update to 1.7 I will make a note of it in the update changelog for people to try.
The list will remain 1.6.4 until at least 30% of the mods have updated to whatever version is settled upon.